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US 2026/0213596 A1Published application
Permanent magnet rotor and method for manufacturing permanent magnet rotor
AssigneeMitsubishi Electric Corporation
InventorsTakuya NAKAMURA, Junji OKADA, Yuichiro OHASHI, Motoaki NISHIBU
Life of this patent
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Abstract
A permanent magnet rotor includes a rotating shaft, an inner peripheral magnet that holds the rotating shaft and is a cylindrical bonded magnet, and an outer peripheral magnet that is provided on an outer peripheral side of the inner peripheral magnet and is a cylindrical bonded magnet. The inner peripheral magnet has, at one axial end of the inner peripheral magnet, a plurality of first recesses circumferentially disposed at equal intervals.
Claims7
A permanent magnet rotor comprising:
- a rotating shaft;
- an inner peripheral magnet holding the rotating shaft and being a cylindrical bonded magnet;
- and
- an outer peripheral magnet provided on an outer peripheral side of the inner peripheral magnet and being a cylindrical bonded magnet, wherein
- the inner peripheral magnet has, at one axial end of the inner peripheral magnet, a plurality of first recesses circumferentially disposed at equal intervals, and
- with respect to an angle about the rotating shaft, the plurality of first recesses is disclosed at angles that coincide with angles of magnetic pole centers of N poles or S poles of the inner peripheral magnet and the outer peripheral magnet.
3 more elements
(canceled)
A method of manufacturing a permanent magnet rotor, the method comprising:
- disposing, around a rotating shaft, a first mold including a first upper mold, a first lower mold, and a first magnetic field orientation mold, the first mold being a mold for forming an inner peripheral magnet that is a bonded magnet and has a plurality of first recesses disposed at equal intervals in a circumferential direction at one axial end of the inner peripheral magnet;
- injection molding a first magnetic resin material into a first space surrounded by the first mold to form the inner peripheral magnet holding the rotating shaft and having the plurality of first recesses at the one axial end of the inner peripheral magnet;
- disposing, around the inner peripheral magnet, a second mold including a second upper mold, a second lower mold, and a second magnetic field orientation mold, the second mold being a mold for forming an outer peripheral magnet that is a bonded magnet;
- and
- injection molding a second magnetic resin material into a second space surrounded by the second mold to form the outer peripheral magnet on an outer side of the inner peripheral magnet holding the rotating shaft, wherein
- with respect to an angle about the rotating shaft, the plurality of first recesses is disposed at angles that coincide with angles of magnetic pile centers of N poles or S poles of the inner peripheral magnet and the other peripheral magnet,
- the second mold has a plurality of protrusions to be fitted to the plurality of first recesses of the inner peripheral magnet, and
- in the injections molding the second magnetic resin material, the plurality of protrusions and the plurality of first recesses are used to perform positioning in a rotation direction to position the inner peripheral magnet and the second mold.
5 more elements
Dependencies are inferred from the claim text.